Virtual Architect is a light version of Envisioneer sold by another company.
I have had clients with it , worked on their projects and sent them .bld files without problems.
As far as the issue goes here, it definitely sounds like a computer related issue. Video card? What I don’t get is that you said same results happen on office pc. The fact that v11 has same issue points to computer. I’ve not heard of anyone having these type of issues.
Sorry for not being able to help.
Jack
zimmerdesign.com